VR experimented with several different designs of bogie vans over the years. They were the basis for the ZLP vans that were introduced a year after these vans. As far as I know they wore passenger red for their entire lives. They were built as C class and recoded CA in 1961.

As built the CA class were coded C, they were recoded CA in 1961, photo date Sept. 1960 at Newport.Official VR photo